also: エスピーエフ
sun protection factor; SPF
Used in the context of sunscreen and cosmetics to indicate the level of UVB protection.
This sunscreen has an SPF of 50.
sender policy framework
Technical term in email authentication; used in IT and network security contexts.
spruce-pine-fir (lumber)
Industry term for a category of softwood lumber; used in construction and woodworking.
This lumber is called SPF lumber.
We set up an SPF record to prevent spoofed emails.